package com.sw.c.utils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;


public class IPAndUserUtil {
    /**获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址,
     *  可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？
     *   答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
     *   如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 用户真实IP为： 192.168.1.110
     * @param request
     * @return
     */
    public static String getReqIp(HttpServletRequest request){
        String ipAddress = request.getHeader("x-forwarded-for");
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){
                //根据网卡取本机配置的IP
                InetAddress inet=null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                ipAddress= inet.getHostAddress();
            }
        }
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15
            if(ipAddress.indexOf(",")>0){
                ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));
            }
        }
        return ipAddress;
    }
    public static String getUserName(HttpServletRequest request){
        String username = request.getHeader("username");
        return username;
    }
    public static Map<String,Object> getUser(HttpServletRequest request){
        String username = request.getHeader("username");
        try {
            if(username!=null){
                username= URLDecoder.decode(username, "UTF-8");
//                username= new String(Base64.getDecoder().decode(username));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        Map<String,Object> map=new HashMap<>();
        map.put("username",username);
        return map;
    }
}
